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Ultrahigh resolution fiber-optic quasi-static strain sensors for geophysical research

机译：用于地球物理研究的超高分辨率光纤准静态应变传感器

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摘要

A review of our recent work on ultrahigh resolution optical fiber sensors in the quasi-static region is presented, and their applications in crustal deformation measurement are introduced. Geophysical research such as studies on earthquake and volcano requires monitoring the earth’s crustal deformation continuously with a strain resolution on the order of nano-strains (n?) in static to low frequency region. Optical fiber sensors are very attractive due to their unique advantages such as low cost, small size, and easy deployment. However, the resolution of conventional optical fiber strain sensors is far from satisfactory in the quasi-static domain. In this paper, several types of recently developed fiber-optic sensors with ultrahigh resolution in the quasi-static domain are introduced, including a fiber Bragg grating (FBG) sensor interrogated with a narrow linewidth tunable laser, an FBG based fiber Fabry-Perot interferometer (FFPI) sensor by using a phase modulation technique, and an FFPI sensor with a sideband interrogation technique. Quantificational analyses and field experimental results demonstrated that the FBG sensor can provide nano-order strain resolution. The sub-nano strain resolution was also achieved by the FFPI sensors in laboratory. Above achievements provide the basis to develop powerful fiber-optic tools for geophysical research on crustal deformation monitoring.
机译：介绍了我们对准静态区域中超高分辨率光纤传感器的最新研究进展，并介绍了它们在地壳形变测量中的应用。诸如地震和火山研究等地球物理研究要求以静态至低频范围内的纳米级应变（n？）量级的应变分辨率连续监测地球的地壳变形。光纤传感器由于其独特的优势（如低成本，小尺寸和易于部署）而非常有吸引力。然而，传统的光纤应变传感器的分辨率在准静态域中远不能令人满意。在本文中，介绍了几种类型的最新开发的在准静态域中具有超高分辨率的光纤传感器，包括使用窄线宽可调激光器询问的光纤布拉格光栅（FBG）传感器，基于FBG的光纤Fabry-Perot干涉仪（FFPI）传感器采用相位调制技术，而FFPI传感器采用边带询问技术。定量分析和现场实验结果表明，FBG传感器可以提供纳米级的应变分辨率。亚纳米应变分辨率也通过实验室中的FFPI传感器实现。以上成就为开发功能强大的光纤工具进行地壳形变监测地球物理研究提供了基础。

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